Unable to sign in to sync

When I attempt to sign into the browser to access sync, the window in the upper right hand corner just disappears as if complete but it doesn't ever sign me in. I am running 51.0.2830.40 and I have verified that I can login at https://auth.opera.com/account/login. Can anyone offer some help on this? I see this issue on both my Opera for Windows and Opera for Mac. Thanks for your time!

@mskhoshnazar you wont lose your bookmarks, if you have it local. Alternatively, you can use the extension EverSync, which is a great tool to backup your bookmarks and also to sync across different browsers.